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Pressure-sensitive adhesive sheet

a technology of adhesive sheets and adhesive sheets, applied in the direction of film/foil adhesives, transportation and packaging, synthetic resin layered products, etc., can solve the problems of deterioration of designability and decorativity

Inactive Publication Date: 2008-12-18
NITTO DENKO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The invention provides a pressure-sensitive adhesive sheet that has excellent light-shielding properties even at a thin thickness. The sheet includes a light-shielding layer, a white or silver layer, and a colored layer, and has a bright color surface while maintaining the light-shielding properties. The sheet is useful for attaching decoration sheets without compromising their decorativity.

Problems solved by technology

Consequently, in the case of using such pressure-sensitive adhesive sheets having the light-shielding layer, a problem of deteriorations in designability and decorativity has occurred due to a phenomenon that the black light-shielding layer is seen through a surface of the decorative sheet.

Method used

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Examples

Experimental program
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Effect test

example 1

[0135]On one side of a white polyethylenetelephthalate (PET) film (a tetron film “TU3#13”, thickness: 13 μm; manufactured by Teijin DuPont Films Japan Limited), multilayer printing of white / silver / black / black / black / white / white / red was performed in this order by using inks (NB-300; manufactured by Dainichiseika Color & Chemicals Mfg. Co. Ltd.) in accordance with a gravure printing method to obtain a base material having a thickness of 24 μm. The acrylic pressure-sensitive adhesive obtained as described above was coated on both sides of the base material in such a manner that the thicknesses of the pressure-sensitive adhesive layers became 5 μm to obtain a double-sided adhesive tape (double-sided pressure-sensitive adhesive sheet) having a thickness of 34 μm.

[0136]Note that “white”, “black”, and the like described above are types of the printing inks, and details thereof will be described later.

[0137]A structure of the double-sided pressure-sensitive adhesive sheet was: transparent pr...

example 2

[0138]On one side of a white polyethylenetelephthalate (PET) film (a tetron film “TU3#13”, thickness: 13 μm; manufactured by Teijin DuPont Films Japan Limited), multilayer printing of white / silver / black / black / black / white / white / pink was performed in this order by using inks (NB-300; manufactured by Dainichiseika Color & Chemicals Mfg. Co. Ltd.) in accordance with a gravure printing method to obtain a base material having a thickness of 24 μm. The acrylic pressure-sensitive adhesive obtained as described above was coated on both sides of the base material in such a manner that the thicknesses of the pressure-sensitive adhesive layers became 5 μm to obtain a double-sided adhesive tape (double-sided pressure-sensitive adhesive sheet) having a thickness of 34 μm.

example 3

[0139]On one side of a white polyethylenetelephthalate (PET) film (a tetron film “TU3#13”, thickness: 13 μm; manufactured by Teijin DuPont Films Japan Limited), multilayer printing of white / silver / black / black / black / white / white / dark blue was performed in this order by using inks (NB-300; manufactured by Dainichiseika Color & Chemicals Mfg. Co. Ltd.) in accordance with a gravure printing method to obtain a base material having a thickness of 24 μm. The acrylic pressure-sensitive adhesive obtained as described above was coated on both sides of the base material in such a manner that the thicknesses of the pressure-sensitive adhesive layers became 5 μm to obtain a double-sided adhesive tape (double-sided pressure-sensitive adhesive sheet) having a thickness of 34 μm.

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Abstract

The present invention relates to a pressure-sensitive adhesive sheet including: a laminated structure in which a light-shielding layer, a white or silver layer, and a colored layer are laminated in this order; and at least one pressure-sensitive adhesive layer as at least one surface layer, in which at least one surface of the pressure-sensitive adhesive sheet has L* of 30 or more and C* of 3 or more, L* representing a luminosity and C* representing a chromaticness, and in which the pressure-sensitive adhesive sheet as a whole has a transmittance of a light having a wavelength of 550 nm of 0.3% or less. The pressure-sensitive adhesive sheet of the invention is excellent in light-shielding property irrespective of the thinness thereof as well as in decorativity due to the surface thereof that is colored with a bright color.

Description

FIELD OF THE INVENTION[0001]The present invention relates to a pressure-sensitive adhesive sheet. More specifically, it relates to a pressure-sensitive adhesive sheet excellent in light-shielding property irrespective of the thinness thereof as well as in decorativity due to the surface thereof that is colored with a bright color.BACKGROUND OF THE INVENTION[0002]Recently, decoration on a surface of a housing of a mobile phone or a portable game console by attaching to the surface a decoration sheet on which a pattern or the like is printed has been carried out. For attaching such a decoration sheet, a pressure-sensitive adhesive sheet such as a double-sided pressure-sensitive adhesive sheet has been generally used.[0003]In recent years, a liquid crystal display (LCD) is often provided on housings of mobile phones, and a pressure-sensitive adhesive sheet to be used for such housings is required to have a light-shielding property from the viewpoints of prevention of stray light from t...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): B32B7/00C09J7/29
CPCB32B7/12C09J7/0296Y10T428/1438Y10T428/2848Y10T428/1471Y10T428/1433Y10T428/28Y10T428/14Y10T428/1476Y10T428/24802C09J7/29Y10T428/31504Y10T428/8305
Inventor YOKOYAMA, JUNJIINOKUCHI, SHINJI
Owner NITTO DENKO CORP
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